For example, if a single generator fails, noncritical loads can be shed or not added in the first place. Leveraging this fact can increase the overall reliability of the system, especially with paralleled generators. In some cases, not all loads are critical. Next, the engineer should establish the critical loads and the reliability required. Environmental Protection Agency can have more stringent pollution-control requirements for generators that operate while normal power is available. For example, NFPA 110: Standard for Emergency and Standby Power Systems has specific requirements for things like start time for emergency power systems. Also, these considerations define code and environmental requirements to which the project will be exposed. For example, will they use the generation for interruptible service agreements where the utility provides financial incentives in exchange for generation support? Will they be operating in a baseload or peak-shave mode to help minimize demand charges? Or will the system be focused strictly on emergency or standby power?Īnswering these questions is critical for the genset supplier and the design of the electrical distribution system. This document is used throughout the project and defines the rest of the design process.įirst, the design criteria outline the client’s commercial goals. These criteria establish design philosophy consensus early in the project, which can dramatically reduce rework down the road. Finally, paralleled units offer greater operational flexibility, facilitating routine maintenance.Ĭreating thoughtful design criteria helps convert the client’s goals into high-level technical requirements. Also, smaller units can have faster delivery times. Further, systems with multiple generators are more scalable, facilitating system expansion and capital project flexibility. Next, generators can operate closer to their optimal load with demand schemes that take paralleled units offline when they’re not needed. Even if a system does not have fully redundant generation, load-prioritization schemes keep critical loads powered if a generator set fails. First, multiple generators in a system can increase reliability. Benefits of paralleling generators in onsite power systems are well documented.
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